Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy

Jinhua He; Chenhui Wang; Mingrui Liu; Muhammad Ramzan; Zhiwei Long; Xian Gang Wu; Yu Chen; Haizheng Zhong

doi:10.1007/s12274-024-6732-0

Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy

Jinhua He, Chenhui Wang^*, Mingrui Liu, Muhammad Ramzan, Zhiwei Long, Xian Gang Wu, Yu Chen, Haizheng Zhong^*

^*Corresponding author for this work

School of Material Science and Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal synthesis. Herein, we report the negative effects of side reactions of large-size ZnSe quantum dots. The side reactions between oleic acid and oleylamine generated amidation products and H₂O, which led to the hydrolysis of Zn(OA)₂ to Zn(OH)₂ and the subsequent formation of zinc oxide (ZnO) and zinc bis[diphenylphosphinate] (Zn(DPPA)₂) precipitates. These side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related defects. Such negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in combination. By overcoating a ZnS shell, blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91% were obtained. We further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 nm. The device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2% and a maximum luminance of 1223 cd·m⁻². (Figure presented.)

Original language	English
Journal	Nano Research
DOIs	https://doi.org/10.1007/s12274-024-6732-0
Publication status	Accepted/In press - 2024

Keywords

light-emitting diodes
quantum dots
side reactions
surface etching
ZnSe

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10.1007/s12274-024-6732-0

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title = "Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy",

abstract = "The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal synthesis. Herein, we report the negative effects of side reactions of large-size ZnSe quantum dots. The side reactions between oleic acid and oleylamine generated amidation products and H2O, which led to the hydrolysis of Zn(OA)2 to Zn(OH)2 and the subsequent formation of zinc oxide (ZnO) and zinc bis[diphenylphosphinate] (Zn(DPPA)2) precipitates. These side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related defects. Such negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in combination. By overcoating a ZnS shell, blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91% were obtained. We further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 nm. The device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2% and a maximum luminance of 1223 cd·m−2. (Figure presented.)",

keywords = "light-emitting diodes, quantum dots, side reactions, surface etching, ZnSe",

author = "Jinhua He and Chenhui Wang and Mingrui Liu and Muhammad Ramzan and Zhiwei Long and Wu, {Xian Gang} and Yu Chen and Haizheng Zhong",

note = "Publisher Copyright: {\textcopyright} Tsinghua University Press 2024.",

year = "2024",

doi = "10.1007/s12274-024-6732-0",

language = "English",

journal = "Nano Research",

issn = "1998-0124",

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T1 - Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy

AU - He, Jinhua

AU - Wang, Chenhui

AU - Liu, Mingrui

AU - Ramzan, Muhammad

AU - Long, Zhiwei

AU - Wu, Xian Gang

AU - Chen, Yu

AU - Zhong, Haizheng

PY - 2024

Y1 - 2024

N2 - The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal synthesis. Herein, we report the negative effects of side reactions of large-size ZnSe quantum dots. The side reactions between oleic acid and oleylamine generated amidation products and H2O, which led to the hydrolysis of Zn(OA)2 to Zn(OH)2 and the subsequent formation of zinc oxide (ZnO) and zinc bis[diphenylphosphinate] (Zn(DPPA)2) precipitates. These side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related defects. Such negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in combination. By overcoating a ZnS shell, blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91% were obtained. We further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 nm. The device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2% and a maximum luminance of 1223 cd·m−2. (Figure presented.)

AB - The potential use of large-size ZnSe quantum dots as blue emitters for display applications has greatly inspired the colloidal synthesis. Herein, we report the negative effects of side reactions of large-size ZnSe quantum dots. The side reactions between oleic acid and oleylamine generated amidation products and H2O, which led to the hydrolysis of Zn(OA)2 to Zn(OH)2 and the subsequent formation of zinc oxide (ZnO) and zinc bis[diphenylphosphinate] (Zn(DPPA)2) precipitates. These side reactions resulted in the formation of a defective surface including a Se-rich surface and oxygen-related defects. Such negative effects can be overcome by adopting an etching strategy using potassium fluoride and myristic acid in combination. By overcoating a ZnS shell, blue emissive ZnSe/ZnS quantum dots with a maximum photoluminescence quantum yield of up to 91% were obtained. We further fabricated ZnSe quantum dots-based blue light-emitting diodes with an emission peak at 456 nm. The device showed a turn-on voltage of 2.7 V with a maximum external quantum efficiency of 4.2% and a maximum luminance of 1223 cd·m−2. (Figure presented.)

KW - light-emitting diodes

KW - quantum dots

KW - side reactions

KW - surface etching

KW - ZnSe

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U2 - 10.1007/s12274-024-6732-0

DO - 10.1007/s12274-024-6732-0

M3 - Article

AN - SCOPUS:85194535383

SN - 1998-0124

JO - Nano Research

JF - Nano Research

ER -

Overcoming side reaction effects in the colloidal synthesis of ZnSe/ZnS core/shell quantum dots with an etching strategy

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Keywords

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